JP2806631B2 - High-speed solenoid valve device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-speed solenoid valve device for opening and closing a fluid passage at a high speed.

BACKGROUND ART High-speed solenoid valves are used for various controls in a fluid passage, for example, a hydraulic circuit. Such a high-speed solenoid valve can be switched at a high frequency, can operate by directly inputting a digital signal from a control unit such as a microcomputer, and can also control a flow rate by switching at a high frequency. Is excellent. Hereinafter, an example in which a high-speed solenoid valve is used for drive control of a hydraulic cylinder will be described with reference to the drawings.

FIG. 1 is a circuit diagram of a hydraulic circuit using a high-speed solenoid valve. In the figure, 1 is a hydraulic pump and 2 is a servo cylinder. A variable displacement hydraulic pump (not shown), for example, a swash plate, is connected to the rod side of the servo cylinder 2. 3 is a tank, 4A is a high-speed solenoid valve interposed between the hydraulic pump 1 and the head side of the servo cylinder 2,
4B is a high-speed solenoid valve interposed between the head side of the servo cylinder 2 and the tank 3.

In order to properly control the discharge flow rate of the variable displacement hydraulic pump, when a control signal is output from a microcomputer (not shown) to, for example, the high-speed solenoid valve 4A, the high-speed solenoid valve 4A
Is switched to the lower position in the figure. As a result, the servo cylinder 2 is driven in the direction in which the rod extends in accordance with the difference between the pressure receiving areas of both chambers, and increases (decreases) the amount of tilt of the swash plate. Conversely, when the control signal is output to the high-speed solenoid valve 4B and is switched to the lower position, the head side of the servo cylinder 2 is connected to the tank 3, the rod is contracted, and the tilt amount of the swash plate decreases (increases). ). Such an operation is performed with a high degree of responsiveness by directly inputting a digital signal from a microcomputer.

By the way, the high-speed solenoid valve having the above excellent characteristics has the following problems on the other hand. That is, in order to achieve high-speed operation, the high-speed solenoid valve has to reduce the diameter of the spool and shorten its stroke due to its structure. For this reason, the pressure loss increases and the flow rate that can be processed decreases, and as a result, the size, output, and the like of the hydraulic cylinder that can be directly controlled are restricted by themselves. In order to solve this problem, there is a means for increasing the supply pressure to the high-speed solenoid valve, but this means is not preferable because energy loss increases. In addition, it is difficult to increase the size of the high-speed solenoid valve if the current working voltage is applied as it is because of the structural reasons described above. Will be impaired.

In view of such a current situation, the present inventor has described in
A high-speed solenoid valve device disclosed in Japanese Patent No. 292982 was proposed. This high-speed solenoid valve device is shown in FIG. In FIG. 2, reference numeral 10 denotes a main body forming an outer shell of the high-speed solenoid valve device, and an input port 11 is provided.
And an output port 12, and these input ports
A high-speed solenoid valve portion 10A and a logic valve portion 10 are arranged between the output port 11 and the output port 12 so as to be connected vertically. The high-speed solenoid valve portion 10A includes a first sleeve 13 forming an outer shell thereof, an input port 14 formed in the first sleeve 13, a passage 15 which can communicate with the input port 14, and a passage 15 formed in the first sleeve 13. It has an output port 16 communicating therewith, and is provided with a spool 17 movably provided in the first sleeve 13 and capable of opening and closing between the input port 14 and the passage 15, that is, the output port 16. The logic valve portion 10B includes a second sleeve 18 disposed inside the main body 10 so as to surround the first sleeve 13 of the high-speed electromagnetic valve portion 10A, and an input port 19 formed in the second sleeve 18. And an output port 20 that can pass through the input port 19, and a poppet 21 that opens and closes between the input port 19 and the output port 20. Inside the poppet 21, a control room 22 and an input It has a small-diameter through hole 23 for communicating the port 19 with the control chamber 22.

A return spring 24 is disposed in the control room 22 of the poppet 21 and can apply a return force to the poppet 21 and the spool 17.
A stopper 25 is disposed between the first sleeve 13 and the second sleeve 18, that is, between the spool 17 and the poppet 21, and is capable of restricting the movement of the spool 17 and the poppet 21. The return spring 24 and the stop 25 also serve as components of both the high-speed electromagnetic valve unit 10A and the logic valve unit 10B. The input port 19 of the logic valve unit 10B is connected to the main body 1
In addition to communicating with the input port 11 of 0, it communicates with the control chamber 22 through the small-diameter through hole 23 as described above. The control chamber 22 communicates with the input port 14 of the high-speed solenoid valve section 10A via a hole formed in the stopper 25. The output port 20 of the logic valve section 10B and the output port of the high-speed solenoid valve section 10A
16 is an output port 12 of the main body 10 provided in the main body 10.
And a passage 26 communicating with the passage.

The operation performed in this high-speed solenoid valve device is as follows. That is, when the coil of the high-speed solenoid valve 10A is not excited, it is pressed upward in the drawing by the return spring 24 of the spool 17, so that the input port of the main body 10
11, input port 19 of logic valve section 10B, small-diameter through hole 23,
The control room 22, the input port 14 of the high-speed solenoid valve section 10A is connected to the passage 15 and the output port 16 of the high-speed solenoid valve 10A, and the passage 2 of the main body 10.
6, for the output port 12, the first sleeve 13 and the spool 1
It is shut off at the sheet part formed by 7.

Further, the pressure of the input port 11 of the main body 10 and the pressure of the control chamber 22 become equal, and the poppet 21 is moved downward by the pressing force due to the pressure receiving area difference between the upper surface and the lower surface of the poppet 21 and the force of the return spring 24. As a result, the input port 11 of the main body 10 and the input port 19 of the logic valve portion 10B are shut off from the output port 20, the passage 26, and the output port 12 of the main body 10.

In this state, when the coil of the high-speed solenoid valve section 10A is excited, the spool 17 of the high-speed solenoid valve section 10A moves downward in the figure against the force of the return spring 24, and thereby the pressure in the control chamber 22 is reduced. Oil is supplied to the input port 14 and passage 1 of the high-speed solenoid valve 10A.
5, output port 16, output port 12 of main body 10 through passage 26
Is rapidly discharged from Further, the pressure oil guided from the input port 11 of the main body 10 through the input port 19 of the logic valve portion 10B is restricted in the small-diameter through hole 23, and therefore does not flow directly into the control chamber 22. As a result, the pressure in the control chamber 22 is reduced by the outflow from the high-speed electromagnetic valve portion 10A described above, and the poppet 21 is pressed by the force applied to the input port 19 end face and the pressure applied to the output port 20 end face of the poppet 21. The force that pushes 21 upward in the figure is applied to the control room.
Due to the pressure of 22 and the force of the return spring 24, the force becomes larger than the force for pushing the poppet 21 downward in the figure, and the poppet 21 rises until it hits the stop 25. This allows
The input port 19 and the output port 20 of the logic valve portion 10B communicate with each other, and the oil flowing from the input port 11 of the main body 10 passes through the input port 19, the output port 20, and the passage 26 of the logic valve portion 10B,
The oil merges with the oil flowing out of the output port 16 of the high-speed solenoid valve section 10A and is discharged from the output port 12 of the main body 10. At this time, the return spring 24 is deflected by the upward movement of the poppet 21, thereby increasing the force for pushing the spool 17 upward. The force pressing the pool 17 downward is much greater. Therefore, the spool 17 is not pushed up.

In the high-speed solenoid valve device having the above configuration, the high-speed solenoid valve 10
Since the logic valve section 10B is connected to A, when the high-speed solenoid valve section 10A is excited, the communication is performed through both the output port 16 of the high-speed solenoid valve section 10A and the output port 20 of the logic valve section 10B.
Then, the combined pressure oil can be discharged from the output port 12 of the main body 10, so that a larger flow rate can be given to an actuator or the like operated by the high-speed electromagnetic device than in a case where a normal high-speed electromagnetic valve is provided.

Further, in this embodiment, the high-speed electromagnetic valve portion 10A and the logic valve portion 10B are connected vertically in one main body 10, and the return spring 24 and the stopper 25 are connected to the high-speed electromagnetic valve portion 10A and the logic Used as a common part for both valve part 10B, poppet 2
Since the volume between the control chamber 22 and the sheet portion of the spool 17 is set to a small volume such that the stopper 25 can be arranged, the overall formation of the main body 10, that is, the reduction of the outer diameter dimension can be achieved. Can be.

Further, since the volume between the control chamber 22 of the poppet 21 and the seat portion of the spool 17 is set small as described above, the rise and fall response of the pressure of the control chamber 22 is improved, and the response of the spool 17 is improved. Good controllability is obtained.

Despite these excellent advantages, there is a demand for the conventional high-speed solenoid valve device to have a smaller overall size.

An object of the present invention is to provide a high-speed solenoid valve device that solves the above-mentioned problems in the conventional technology and can further reduce the overall size.

DISCLOSURE OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided a main body having a main body input port and a main body output port, and a high-speed solenoid valve portion and a logic valve portion arranged in the main body,
The high-speed solenoid valve portion includes an electromagnetic valve output port that communicates with the main body output port, an electromagnetic valve sleeve in which an electromagnetic valve input port is formed, and an electric signal that communicates the electromagnetic valve input port with a communication passage of the electromagnetic valve output port. The logic valve portion is guided by the inner wall of the main body and has a logic valve input port communicating with the main body input port and a logic valve output port communicating with the main body output port. A poppet that opens and closes a communication path between the logic valve input port and the logic valve output port, and communicates with the logic valve input port formed in the poppet through a small-diameter through hole. A control chamber, a return spring for applying the spool and the poppet return force, and the solenoid valve sleeve and the logic valve sleeve. A high-speed solenoid valve device having a plate that communicates the control chamber and the solenoid valve input port, wherein the solenoid valve sleeve is guided and supported by a guide portion formed on an inner wall of the main body, and The solenoid valve output port is formed directly on the solenoid valve sleeve, the plate is guided and supported by a protrusion formed on the inner peripheral side of the upper end of the logic valve sleeve, and the solenoid sleeve and the plate and the logic valve sleeve are supported. Are placed in close contact with each other in the main body, the plate is arranged so as to be closely interposed between the solenoid valve sleeve and the logic valve sleeve, and the solenoid valve sleeve, the plate and the logic valve sleeve are The outer diameters are almost the same.

When the high-speed solenoid valve section is not excited, the spool returns between the solenoid valve input port and the solenoid valve output port and shuts off with a spring return force, and the poppet also connects between the logic valve input port and the logic valve output port. It is shut off by the return force of the return spring, and the high-speed solenoid valve device is in the shut-off state.

Next, when the high-speed solenoid valve is excited, the spool is driven against the spring force of the return spring, and the solenoid valve input port and the solenoid valve output port conduct. As a result, the fluid in the control chamber is rapidly removed through the solenoid valve input port and the solenoid valve output port, and the poppet is also driven by the fluid pressure against the spring force of the return spring. Port becomes conductive. As a result, the high-speed solenoid valve device becomes conductive.

In the above high-speed solenoid valve device, preferably, the logic valve sleeve is in direct contact with the guide portion on the inner wall of the main body without passing through an O-ring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a hydraulic circuit in which a high-speed solenoid valve device is used.

 FIG. 2 is a sectional view of a main part of a conventional high-speed solenoid valve device.

FIG. 3 is a sectional view of a main part of a high-speed solenoid valve device according to one embodiment of the present invention.

 FIG. 4 is a sectional view taken along the line IV-IV in FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a description will be given based on illustrated embodiments of the present invention.

FIG. 3 is a sectional view of an essential part of the high-speed solenoid valve device according to the embodiment of the present invention, and FIG. 4 is a sectional view taken along the line IV-IV shown in FIG. In each figure, the same reference numerals are given to the same or equivalent parts as those shown in FIG. Reference numeral 30 denotes a main body of the high-speed electromagnetic valve device of the present embodiment, 30S denotes a high-speed electromagnetic valve unit, and 30L denotes a logic valve unit. Reference numeral 31 denotes a sleeve of the high-speed solenoid valve section 30S, which is installed by being guided by guide sections 30a and 30b formed on the inner wall of the main body 30. A passage 31a and an input port 31b are formed in the sleeve 31, and both are shut off by the spool 17 urged by the spring force of the spring 24 when the high-speed solenoid valve section 30S is not excited.

Reference numeral 32 denotes a ring-shaped plate having an opening at the center, and is installed in a guide portion 30b formed on the inner wall of the main body 30.

Reference numeral 33 denotes a sleeve of the logic valve section 30L.
1. It is installed and guided by a guide portion 30c formed on the inner wall of the main body 30 in the same manner as the plate 32. The lower end surface and the outer peripheral surface of the sleeve 33 are in direct contact with the inner wall including the guide portion 30c of the main body 30 without passing through the O-ring, and the sealing performance is ensured by processing these contact surfaces with high precision. .

In the sleeve 33, the control room 22, the poppet 21 having the small-diameter through hole 23 is sought, and the protrusion 33a, the input port 3
3b and an output port 33c are formed. Input port 33b
The output port 33c is shut off by the poppet 21 to which the spring force of the spring 24 and the fluid pressure of the control chamber 22 are applied when the high-speed solenoid valve section 30S is not excited.

The sleeve 31, the plate 32, and the sleeve 33 all have substantially the same outer diameter, and they are installed in close contact with one another. Further, the plate 32 is configured to be guided by a protruding portion 33a formed on the inner peripheral side of the upper end of the sleeve 33.

Numeral 34 designates 2 formed on the guide portion 30b as shown in FIG.
Two grooves, 35 and 36, show passages. The groove 31 and the passages 35 and 36 connect the passage 31a of the sleeve 31 to the output port 12, and the passage 36 connects the output port 33c and the output port 12 of the sleeve 33 to each other.

The operation of this embodiment is the same as the operation of the high-speed solenoid valve device shown in FIG. That is, when the high-speed solenoid valve unit 30S is not excited, as described above, the spool 17 and the poppet 21 are in the shut-off position, and as a result, the input port 11 and the output port 12 of the high-speed solenoid valve device are shut off. .

When the high-speed solenoid valve section 3S is excited, the spool 17
Driven against the spring force of
b and the passage 31a are brought into conduction. Thereby, the control room 22
The internal pressure oil is rapidly discharged through the central opening of the plate 32, the input port 31b, and the passage 31a. Therefore, the control room 22
, The poppet 21 is driven by the hydraulic pressure supplied to the input ports 11, 33b against the spring force of the spring 24, and the input port 33b and the output port 33c of the sleeve 33 are brought into conduction. . Thereby, a conduction state is established between the input port 11 and the output port 12 of the high-speed solenoid valve device.

Thus, in the present embodiment, the sleeve 31, the plate 32
And the sleeve 33 is guided by the respective guide portions formed on the inner wall of the main body 30, so that the advantages of the conventional high-speed solenoid valve device shown in FIG. It is no longer necessary to guide the sleeve, and as a result, the radial dimension can be greatly reduced. In addition, since the sleeve 33, the plate 32, and the sleeve 31 are simply stacked and installed on the main body in this order, the configuration is simple and easy to assemble. Further, since the lower end surface and the outer peripheral surface of the sleeve 33 are configured to be in direct contact with the main body without passing through the O-ring, the number of parts and the number of processing steps can be reduced.

Industrial Applicability According to the present invention, since the solenoid valve sleeve, the plate and the logic valve sleeve are guided by the inner wall of the main body,
In addition to the advantages of the conventional device, the size in the radial direction can be greatly reduced. Further, since the solenoid valve sleeve, the plate, and the logic valve sleeve are simply stacked, the configuration can be simplified and the assembly can be facilitated.

Claims (2)

(57) [Claims] 1. A main body (30) having a main body input port (11) and a main body output port (12), a high-speed solenoid valve section (30S) and a logic valve section (30L) disposed in the main body. The high-speed solenoid valve portion includes a solenoid valve output port (31a) communicating with the main body output port, and a solenoid valve input port (31
b) a solenoid valve sleeve formed with a solenoid valve sleeve, and a spool that opens and closes a communication path between the solenoid valve input port and the solenoid valve output port at a high speed in response to an electric signal. Is a logic valve input port (33) that is guided by the inner wall of the main body and communicates with the main body input port.
b) a logic valve sleeve (33) having a logic valve output port (33c) communicating with the main body output port;
A poppet (21) for opening and closing a communication path between the logic valve input port and the logic valve output port, and a control chamber communicating with the logic valve input port formed in the poppet through a small-diameter through hole (23). (22) and a return spring (24) for applying a return force to the spool and the poppet.
And a plate (32) disposed between the solenoid valve sleeve (31) and the logic valve sleeve (33), and communicating the control chamber with the solenoid valve input port. The solenoid valve sleeve (31) is guided and supported by guide portions (30a, 30b) formed on the inner wall of the main body (30), and the solenoid valve output port (31a) is directly connected to the solenoid valve sleeve (31). And the plate (32) is formed on the inner peripheral side of the upper end of the logic valve sleeve (33).
The plate (32) is guided and supported by the electromagnetic valve sleeve (31) while the electromagnetic sleeve and plate (32) and the logic valve sleeve (33) are closely stacked in the main body. And the logic valve sleeve (3
3) wherein the solenoid valve sleeve (31), the plate (32) and the logic valve sleeve (33) have substantially the same outer diameter, and are arranged so as to be closely interposed between the high-speed solenoid valve and the high-speed solenoid valve. apparatus. 2. The high-speed solenoid valve device according to claim 1, wherein said logic valve sleeve (33) is connected to said main body (3).
A high-speed solenoid valve device characterized by being in direct contact with the guide portion (30c) on the inner wall of (0) without passing through an O-ring.